Submerged-arc welding flat characteristic current preset control circuit

Abstract

The utility model discloses a submerged arc welding flat characteristic current preset control circuit, and belongs to the technical field of high-power inverter submerged arc welding machines. Comprising a proportional integral circuit, a signal following circuit and a signal amplification circuit which are respectively connected with the proportional integral circuit, a first signal attenuation filter circuit connected with the signal following circuit, and a second signal attenuation filter circuit connected with the signal amplification circuit. According to the utility model, actual current is input through the first signal attenuation filter circuit, preset current is input through the second signal attenuation filter circuit, and calculation processing is carried out by the proportional integral circuit, so that the current output by the submerged-arc welding flat characteristic current preset control circuit fluctuates within a small range of the preset current; the problem that the welding current cannot be predicted can be solved, meanwhile, when the welding wire is replaced and the extension length of the rod is adjusted, the actual welding current can be stably and accurately controlled, and the welding efficiency and quality are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-power inverter submerged arc welding machines, and in particular relates to a submerged arc welding flat characteristic current preset control circuit. Background Art

[0002] At present, the flat characteristic control circuits used in the field of high-power inverter submerged arc welding machines generally have the problem that the current cannot be preset. Only the wire feeding speed can be preset. In practice, the motor that controls the wire speed feeds the wire at a constant speed. The actual welding current has a large error and is greatly affected by the rod elongation and the thickness of the welding wire, which directly affects the welding effect and the operator's sensory experience is very poor. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a submerged arc welding flat characteristic current preset control circuit, which solves the problem that the operator cannot predict the actual current size when performing submerged arc welding because the welding current is affected by the elongation of the rod and the thickness of the welding wire.

[0004] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is: a submerged arc welding flat characteristic current preset control circuit, including: a proportional integral circuit, a signal following circuit and a signal amplifying circuit respectively connected to the proportional integral circuit, a first signal attenuation filter circuit connected to the signal following circuit, and a second signal attenuation filter circuit connected to the signal amplifying circuit.

[0005] The beneficial effects of the utility model are as follows: the utility model provides a submerged arc welding flat characteristic current preset control circuit, which inputs actual current through a first signal attenuation filter circuit, inputs preset current through a second signal attenuation filter circuit, and is calculated and processed by a proportional integral circuit, so that the current output by the submerged arc welding flat characteristic current preset control circuit fluctuates within a small range of the preset current, eliminating the problem of unpredictable welding current. At the same time, when replacing the welding wire and adjusting the rod extension length, the actual welding current can be stably and accurately controlled, thereby improving welding efficiency and quality.

[0006] Further: the proportional integral circuit comprises: an amplifier chip IC1C;

[0007] The 10th pin of the amplifier chip IC1C is grounded, the 9th pin of the amplifier chip IC1C is respectively connected to one end of the resistor R3, one end of the resistor R10, the positive electrode of the diode D1, one end of the resistor R6, and one end of the capacitor C5, the 8th pin of the amplifier chip IC1C is respectively connected to the negative electrode of the diode D1, the other end of the resistor R6, and the other end of the capacitor C5, and serves as the output port of the submerged arc welding flat characteristic current preset control circuit, the other end of the resistor R3 is respectively connected to one end of the resistor R2 and one end of the capacitor C3, the other end of the resistor R2 is connected to the signal follower circuit, the other end of the capacitor C3 is connected to one end of the capacitor C2 and grounded, the other end of the capacitor C2 is respectively connected to one end of the resistor R5 and the other end of the resistor R10, and the other end of the resistor R5 is connected to the signal amplification circuit.

[0008] Further: the signal follower circuit includes: an amplifier chip IC1A;

[0009] The 11th pin of the amplifier chip IC1A is connected to a -12V power supply, the 4th pin of the amplifier chip IC1A is connected to a +12V power supply, the 3rd pin of the amplifier chip IC1A is connected to a first signal attenuation filter circuit, and the 2nd pin of the amplifier chip IC1A is respectively connected to the 1st pin of the amplifier chip IC1A and the other end of the resistor R2.

[0010] Further: the first signal attenuation filter circuit includes: a resistor R1, a resistor R4 and a capacitor C1;

[0011] One end of the resistor R1 serves as the actual current input port of the submerged arc welding flat characteristic current preset control circuit, and the other end of the resistor R1 is respectively connected to one end of the capacitor C1, one end of the resistor R4 and the third pin of the amplifier chip IC1A, and the other end of the capacitor C1 is connected to the other end of the resistor R4 and grounded.

[0012] Further: the signal amplification circuit comprises: an amplifier chip IC1B;

[0013] The 5th pin of the amplifier chip IC1B is grounded, the 6th pin of the amplifier chip IC1B is respectively connected to the second signal attenuation filter circuit and one end of the resistor R9, and the other end of the resistor R9 is respectively connected to the 7th pin of the amplifier chip IC1B and the other end of the resistor R5.

[0014] Further: the second signal attenuation filter circuit includes: a variable resistor PAJ;

[0015] One end of the variable resistor PAJ serves as a preset current input port of the submerged arc welding flat characteristic current preset control circuit, and the other end of the variable resistor PAJ is respectively connected to one end of the capacitor C4, one end of the resistor R7, and one end of the resistor R8. The other end of the capacitor C4 is connected to the other end of the resistor R7 and is grounded, and the other end of the resistor R8 is connected to the 6th pin of the amplifier chip IC1B. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a submerged arc welding flat characteristic current preset control circuit of the utility model;

[0017] Figure 2 The utility model is a schematic diagram of a submerged arc welding flat characteristic current preset control circuit. DETAILED DESCRIPTION

[0018] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0019] like Figure 1 As shown, it is a structural diagram of the submerged arc welding flat characteristic current preset control circuit of the utility model, including: a proportional integral circuit, a signal following circuit and a signal amplifying circuit respectively connected to the proportional integral circuit, a first signal attenuation filtering circuit connected to the signal following circuit, and a second signal attenuation filtering circuit connected to the signal amplifying circuit.

[0020] like Figure 2 As shown, it is a schematic diagram of the submerged arc welding flat characteristic current preset control circuit of the utility model, wherein the proportional integral circuit includes: an amplifier chip IC1C;

[0021] The 10th pin of the amplifier chip IC1C is grounded, the 9th pin of the amplifier chip IC1C is respectively connected to one end of the resistor R3, one end of the resistor R10, the positive electrode of the diode D1, one end of the resistor R6, and one end of the capacitor C5, the 8th pin of the amplifier chip IC1C is respectively connected to the negative electrode of the diode D1, the other end of the resistor R6, and the other end of the capacitor C5, and serves as the output port of the submerged arc welding flat characteristic current preset control circuit, the other end of the resistor R3 is respectively connected to one end of the resistor R2 and one end of the capacitor C3, the other end of the resistor R2 is connected to the signal follower circuit, the other end of the capacitor C3 is connected to one end of the capacitor C2 and grounded, the other end of the capacitor C2 is respectively connected to one end of the resistor R5 and the other end of the resistor R10, and the other end of the resistor R5 is connected to the signal amplification circuit.

[0022] The signal follower circuit includes: an amplifier chip IC1A;

[0023] The 11th pin of the amplifier chip IC1A is connected to the -12V power supply, the 4th pin of the amplifier chip IC1A is connected to the +12V power supply, the 3rd pin of the amplifier chip IC1A is connected to the first signal attenuation filter circuit, and the 2nd pin of the amplifier chip IC1A is respectively connected to the 1st pin of the amplifier chip IC1A and the other end of the resistor R2.

[0024] The first signal attenuation filter circuit includes: a resistor R1, a resistor R4 and a capacitor C1;

[0025] One end of the resistor R1 serves as the actual current input port of the submerged arc welding flat characteristic current preset control circuit, and the other end of the resistor R1 is respectively connected to one end of the capacitor C1, one end of the resistor R4 and the third pin of the amplifier chip IC1A, and the other end of the capacitor C1 is connected to the other end of the resistor R4 and grounded.

[0026] The signal amplification circuit includes: an amplifier chip IC1B;

[0027] The 5th pin of the amplifier chip IC1B is grounded, the 6th pin of the amplifier chip IC1B is respectively connected to the second signal attenuation filter circuit and one end of the resistor R9, and the other end of the resistor R9 is respectively connected to the 7th pin of the amplifier chip IC1B and the other end of the resistor R5.

[0028] The second signal attenuation filter circuit includes: a variable resistor PAJ;

[0029] One end of the variable resistor PAJ serves as the preset current input port of the submerged arc welding flat characteristic current preset control circuit, and the other end of the variable resistor PAJ is respectively connected to one end of the capacitor C4, one end of the resistor R7, and one end of the resistor R8. The other end of the capacitor C4 is connected to the other end of the resistor R7 and grounded, and the other end of the resistor R8 is connected to the 6th pin of the amplifier chip IC1B.

[0030] The following is an explanation of the working process and principle of the submerged arc welding flat characteristic current preset control circuit of the utility model:

[0031] The utility model discloses a submerged arc welding flat characteristic current preset control circuit which is powered by an external ±12V DC power supply, and has two input ports and one output port; the input end of the first signal attenuation filter circuit is the actual current input end of the submerged arc welding flat characteristic current preset control circuit, the actual current input passes through the first attenuation filter circuit, and then is input to the third pin of the signal follower, and after being processed by the signal follower, the actual current is output to the proportional integral circuit through the first pin of the signal follower; the input end of the second signal attenuation filter circuit is the preset current input end of the submerged arc welding flat characteristic current preset control circuit, the preset current input passes through the second attenuation filter circuit, and then is input to the sixth pin of the signal amplifier, and after being processed by the signal amplifier, the actual current is input to the proportional integral circuit through the seventh pin of the signal amplifier; the output of the proportional integral circuit is the output current end of the submerged arc welding flat characteristic current preset control circuit, the output current fluctuates within a relatively small range above and below the preset current, maintains a relatively stable current, and enters the pulse width modulation circuit, so that the wire feeder is in a uniform speed control state, achieves dynamic balance, ensures the stability of the welding current, and improves the welding efficiency and quality.

[0032] The beneficial effects of the utility model are as follows: the utility model provides a submerged arc welding flat characteristic current preset control circuit, which inputs actual current through a first signal attenuation filter circuit, inputs preset current through a second signal attenuation filter circuit, and is calculated and processed by a proportional integral circuit, so that the current output by the submerged arc welding flat characteristic current preset control circuit fluctuates within a small range of the preset current, eliminating the problem of unpredictable welding current. At the same time, when replacing the welding wire and adjusting the rod extension length, the actual welding current can be stably and accurately controlled, thereby improving welding efficiency and quality.

Claims

1. A submerged arc welding flat characteristic current preset control circuit, characterized in that: include: A proportional integration circuit, a signal follower circuit and a signal amplifier circuit respectively connected to the proportional integration circuit, a first signal attenuation filter circuit connected to the signal follower circuit, and a second signal attenuation filter circuit connected to the signal amplifier circuit.

2. The submerged arc welding flat characteristic current preset control circuit according to claim 1, characterized in that: The proportional integral circuit comprises: an amplifier chip IC1C; The 10th pin of the amplifier chip IC1C is grounded, the 9th pin of the amplifier chip IC1C is respectively connected to one end of the resistor R3, one end of the resistor R10, the positive electrode of the diode D1, one end of the resistor R6, and one end of the capacitor C5, the 8th pin of the amplifier chip IC1C is respectively connected to the negative electrode of the diode D1, the other end of the resistor R6, and the other end of the capacitor C5, and serves as the output port of the submerged arc welding flat characteristic current preset control circuit, the other end of the resistor R3 is respectively connected to one end of the resistor R2 and one end of the capacitor C3, the other end of the resistor R2 is connected to the signal follower circuit, the other end of the capacitor C3 is connected to one end of the capacitor C2 and grounded, the other end of the capacitor C2 is respectively connected to one end of the resistor R5 and the other end of the resistor R10, and the other end of the resistor R5 is connected to the signal amplification circuit.

3. The submerged arc welding flat characteristic current preset control circuit according to claim 2, characterized in that: The signal follower circuit comprises: an amplifier chip IC1A; The 11th pin of the amplifier chip IC1A is connected to a -12V power supply, the 4th pin of the amplifier chip IC1A is connected to a +12V power supply, the 3rd pin of the amplifier chip IC1A is connected to a first signal attenuation filter circuit, and the 2nd pin of the amplifier chip IC1A is respectively connected to the 1st pin of the amplifier chip IC1A and the other end of the resistor R2.

4. The submerged arc welding flat characteristic current preset control circuit according to claim 3, characterized in that: The first signal attenuation filter circuit includes: a resistor R1, a resistor R4 and a capacitor C1; One end of the resistor R1 serves as the actual current input port of the submerged arc welding flat characteristic current preset control circuit, and the other end of the resistor R1 is respectively connected to one end of the capacitor C1, one end of the resistor R4 and the third pin of the amplifier chip IC1A, and the other end of the capacitor C1 is connected to the other end of the resistor R4 and grounded.

5. The submerged arc welding flat characteristic current preset control circuit according to claim 2, characterized in that: The signal amplification circuit comprises: an amplifier chip IC1B; The 5th pin of the amplifier chip IC1B is grounded, the 6th pin of the amplifier chip IC1B is respectively connected to the second signal attenuation filter circuit and one end of the resistor R9, and the other end of the resistor R9 is respectively connected to the 7th pin of the amplifier chip IC1B and the other end of the resistor R5.

6. The submerged arc welding flat characteristic current preset control circuit according to claim 5, characterized in that: The second signal attenuation filter circuit includes: a variable resistor PAJ; One end of the variable resistor PAJ serves as a preset current input port of the submerged arc welding flat characteristic current preset control circuit, and the other end of the variable resistor PAJ is respectively connected to one end of the capacitor C4, one end of the resistor R7, and one end of the resistor R8. The other end of the capacitor C4 is connected to the other end of the resistor R7 and is grounded, and the other end of the resistor R8 is connected to the 6th pin of the amplifier chip IC1B.

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